A method for producing a web of packaging material and an apparatus thereof

A printing plate cylinder for printing décors onto a web of packaging material, said printing plate cylinder comprising:

• at least two printing plates, wherein each printing plate have different printing patterns such that sequences of sections of the web with different décors are provided, wherein each section of the web is arranged to be transformed into a package filled with food product in a roll-fed filling machine such that tracing errors of the web inside the packaging machine can be compensated for.

A control circuity comprising a processor, a memory and a transceiver, said processor being arranged to:

• in response to control data for a web feeding arrangement in a packaging machine, estimate a control data-based position for a section of the web downstream a web buffer station,
• in response to registered different décors captured by an image capturing device placed in a position of a web path downstream the web buffer station, identify a deviation between the control-data based position and a décor-based position determined based on the different décors registered by the image capturing device, and
• in case the deviation is found, adjust the tracing of the web by compensating for the deviation identified.